// Copyright (c) 1996-99 The Regents of the University of California. All
// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies.  This software program and
// documentation are copyrighted by The Regents of the University of
// California. The software program and documentation are supplied "AS
// IS", without any accompanying services from The Regents. The Regents
// does not warrant that the operation of the program will be
// uninterrupted or error-free. The end-user understands that the program
// was developed for research purposes and is advised not to rely
// exclusively on the program for any reason.  IN NO EVENT SHALL THE
// UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
// CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

package org.tigris.gef.util;

public class PredicateType implements Predicate {

    // //////////////////////////////////////////////////////////////
    // instance variables
    Class _patterns[];
    int _numPats;
    String _printString = null;

    // //////////////////////////////////////////////////////////////
    // constructor
    protected PredicateType(Class pats[]) {
        this(pats, pats.length);
    }

    protected PredicateType(Class pats[], int numPats) {
        _patterns = pats;
        _numPats = numPats;
    }

    public static PredicateType create() {
        return new PredicateType(null, 0);
    }

    public static PredicateType create(Class c0) {
        Class classes[] = new Class[1];
        classes[0] = c0;
        return new PredicateType(classes);
    }

    public static PredicateType create(Class c0, Class c1) {
        Class classes[] = new Class[2];
        classes[0] = c0;
        classes[1] = c1;
        return new PredicateType(classes);
    }

    public static PredicateType create(Class c0, Class c1, Class c2) {
        Class classes[] = new Class[3];
        classes[0] = c0;
        classes[1] = c1;
        classes[2] = c2;
        return new PredicateType(classes);
    }

    // //////////////////////////////////////////////////////////////
    // Predicate implementation
    public boolean predicate(Object o) {
        if (_numPats == 0)
            return true;
        for (int i = 0; i < _numPats; i++) {
            if (_patterns[i].isInstance(o))
                return true;
        }
        return false;
    }

    public boolean isPredicateFor(Object o) {
        for (int i = 0; i < _numPats; i++) {
            if (_patterns[i].equals(o))
                return true;
        }
        return false;
    }

    // //////////////////////////////////////////////////////////////
    // printing

    public String toString() {
        if (_printString != null)
            return _printString;
        if (_numPats == 0)
            return "Any Type";
        String res = "";
        for (int i = 0; i < _numPats; i++) {
            String clsName = _patterns[i].getName();
            int lastDot = clsName.lastIndexOf(".");
            clsName = clsName.substring(lastDot + 1);
            res += clsName;
            if (i < _numPats - 1)
                res += ", ";
        }
        _printString = res;
        return res;
    }

} /* end class PredicateType */
